Next tonight, new this week, a guilty plea and a warning about cars too risky to drive, vehicles damaged and never supposed to go back on the road. ABC's gio Benitez shows what to look for before you drive off the used car lot. Reporter: After super storm sandy an estimated 100 thousand water battered cars ended up back on the lot. All these flood cars left at an airport in Long Island disappeared and the big question, where did they go? Flood cars literally rot from the inside out. Days, weeks or months down the road, parts are going to fail. Reporter: And as ABC news started investigating, we tracked down one of these cars being sold to unsuspecting buyers. If I can walk away giving you 20 for everything -- Take it now? I want to take it now. Okay. Come inside. Reporter: Just this week that boss pled guilty to selling seven flood cars. He faces three years in prison. The salesman we met, jack, he's facing three pending charges. He did tell our producer that a red flag had come up on car fax. It said something about a flood on it, like a glitch or mistake but auto check everything is clean. You think that the flood is a glitch? Yeah. It's not because everything is clean on it. The title, everything is clean on it. Reporter: The car that ABC bought was checked out by a mechanic. That's definitely water driven, there's no doubt about that. That's like fine silt. Reporter: To avoid damage like this, the New Jersey attorney general telling us check the vehicle's history and beware of potential frud. Obtain a vehicle history report from the dealer or get one yourself, all advice to keep your bank account from going under water, too. Gio Benitez, ABC news, New York.

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